cleanup py3.8 #709

Job	Run time
Linux / Python 3.9 / tox -e security	23s
Linux / Python 3.10 / tox -e security	27s
Linux / Python 3.11 / tox -e security	24s
Linux / Python 3.10 / tox -e lint	21s
Linux / Python 3.9 / tox -e type-checking	29s
Linux / Python 3.10 / tox -e type-checking	32s
Linux / Python 3.11 / tox -e type-checking	29s
Linux / Python 3.9 / tox -e py39	3m 48s
Linux / Python 3.9 / tox -e py39-no-ext	3m 36s
Linux / Python 3.10 / tox -e py310	3m 34s
Linux / Python 3.10 / tox -e py310-no-ext	3m 28s
Linux / Python 3.11 / tox -e py311	3m 22s
Linux / Python 3.12 / tox -e py312	3m 42s
Linux / Python 3.12 / tox -e py312-no-ext	6m 41s
Linux / Python 3.13 / tox -e py313	3m 40s
Linux / Python 3.13 / tox -e py313-no-ext	3m 36s
Windows / Python 3.9 / tox -e py39-no-ext	4m 52s
Windows / Python 3.10 / tox -e py310-no-ext	4m 16s
Windows / Python 3.11 / tox -e py311-no-ext	4m 14s
	51m 54s

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